Ultraviolet-C (UVC) radiation-based sanitization has globally gained enormous importance in the current COVID-19 (caused by SARS-COV-2 virus) pandemic situation. The effectiveness of radiation sanitization is quantified in terms of ‘radiation dose’, which in turn is derived from a radiometric parameter ‘irradiance’, measured using UVC radiometer. Metrological traceability of irradiance/dose measurement is essentially required for achieving requisite accuracy of measurements, and hence germicidal efficacy. In the present article, the derivation of traceability for irradiance measurement using UVC radiometer is demonstrated. The critical conditions to be considered while using detector/radiometer for measuring UVC irradiance/dose in practical conditions are elaborated, avoiding which, significant errors in the UVC irradiance/dose may arise, and hence, may compromise the performance of the Ultraviolet Germicidal Irradiation (UVGI) devices.

在当前的 COVID-19（由 SARS-COV-2 病毒引起）大流行情况下，基于紫外线 C (UVC) 辐射的消毒在全球范围内获得了巨大的重要性。辐射消毒的有效性是用“辐射剂量”来量化的，而辐射剂量又来自使用 UVC 辐射计测量的辐射参数“辐照度”。辐照度/剂量测量的计量可追溯性对于实现必要的测量精度和杀菌功效是必不可少的。在本文中，演示了使用 UVC 辐射计进行辐照度测量的可追溯性推导。详细阐述了在实际条件下使用探测器/辐射计测量 UVC 辐照度/剂量时要考虑的关键条件，避免可能出现 UVC 辐照度/剂量的重大误差，